*Heading Exterior air model for sequentially coupled acoustic analysis of a muffler M, KG, S ** ---------------------------------------------------------------- ** ** PART INSTANCE: InteriorAir-1 ** *Node, input=muffler_intair_nodes.inp *Element, type=AC3D10, input=muffler_intair_elem.inp ** ---------------------------------------------------------------- *Elset, elset=InteriorAir-1_I1, generate 549, 1457, 1 *Solid Section, elset=InteriorAir-1_I1, material=airabsorb 1., ** ---------------------------------------------------------------- *Elset, elset=InteriorAir-1_I2, generate 1, 548, 1 *Solid Section, elset=InteriorAir-1_I2, material=air 1., ** ---------------------------------------------------------------- ** ** PART INSTANCE: MufflerShell-1 ** *Node,nset=shell,input=muffler_shell_nodes.inp *Element, type=S4R, input=muffler_shell_elem.inp ** ---------------------------------------------------------------- *Elset, elset=MufflerShell-1_I1, generate 1458, 1500, 1 *Shell Section, elset=MufflerShell-1_I1, material=steel 0.00075, 5 ** ---------------------------------------------------------------- *Nset, nset=shellsym,unsorted 3301,3376,3375,3299,3373,3297,3340,3339,3338,3337,3336,3335,3334,3333,3332,3331 3330,3329,3328,3327,3326,3325,3324,3323,3322,3321,3320,3319,3318,3317,3316,3315 3314,3313,3312,3311,3310,3309,3295,3307,3292,3304,3303,3291 ** ---------------------------------------------------------------- *Nset, nset=shellconstraint,unsorted 3302,3377,3378,3300,3374,3298,3341,3342,3343,3344,3345,3346,3347,3348,3349,3350 3351,3352,3353,3354,3355,3356,3357,3358,3359,3360,3361,3362,3363,3364,3365,3366 3367,3368,3369,3370,3371,3372,3296,3308,3293,3305,3306,3294 ** ---------------------------------------------------------------- *Nset, nset=shelldisp 3304,3325,3375 ** ---------------------------------------------------------------- *Nset, nset=centerline 10, 11, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 831, 832, 833 834, 835, 836, 837, 838, 839, 840, 841, 842, 843, 844, 845, 846, 847, 848, 849 850, 851, 852, 853, 854, 855, 856, 857, 858, 859, 860, 861, 862, 863, 864, 865 866, 867, 868, 869, 870, 871, 872, 873, 874, 875, 876, 877, 878, 879, 880, 881 882, 883, 884, 885, 886, 887, 888, 889, 890 ** ---------------------------------------------------------------- *Nset, nset=inletpressure 11, 12, 13, 177, 186, 618, 891, 892, 893, 913, 914, 915 ** ---------------------------------------------------------------- *Nset, nset=inletpressure 11, 12, 13, 177, 186, 618, 891, 892, 893, 913, 914, 915 ** ---------------------------------------------------------------- *Elset, elset=_innerairoutlet_S4 288, 299, 367 *Surface, name=innerairoutlet _innerairoutlet_S4, S4 ** ---------------------------------------------------------------- *Elset, elset=_innerair2shell_S1 367, 374, 384, 385, 386, 387, 388, 392, 393, 894, 895, 896, 1192, 1195, 1196, 1197 1198, 1201, 1202, 1203, 1210, 1213, 1214, 1216, 1237, 1238, 1239, 1240, 1243, 1248, 1250, 1330 1331, 1334, 1337, 1341, 1359 *Elset, elset=_innerair2shell_S4 370, 373, 375, 380, 383, 391, 559, 634, 894, 895, 1193, 1194, 1200, 1204, 1206, 1208 1211, 1212, 1215, 1217, 1235, 1242, 1244, 1246, 1247, 1249, 1251, 1276, 1298, 1320, 1321, 1322 1323, 1326, 1329, 1335, 1336, 1338, 1340, 1343, 1347, 1349 *Elset, elset=_innerair2shell_S2 379, 592, 635, 858, 917, 1199, 1205, 1209, 1236, 1241, 1252, 1253, 1254, 1325, 1339, 1344 1345, 1346, 1348, 1350, 1351, 1352, 1353, 1354, 1355, 1356, 1357, 1358, 1360, 1361, 1362 *Elset, elset=_innerair2shell_S3 377, 378, 389, 390, 557, 560, 561, 568, 683, 888, 897, 1207, 1245, 1277, 1324, 1327 1328, 1332, 1333, 1342, 1387, 1388 *Surface, name=innerair2shell _innerair2shell_S1, S1 _innerair2shell_S4, S4 _innerair2shell_S2, S2 _innerair2shell_S3, S3 ** ---------------------------------------------------------------- *Elset, elset=_shell2innerair_SNEG, generate 1458, 1500, 1 *Surface, name=shell2innerair _shell2innerair_SNEG, SNEG ** ---------------------------------------------------------------- *Elset, elset=_innerairabsorb_S3 382, 394, 403, 404, 405, 408, 411, 415, 417, 418, 419, 423, 429, 430, 431, 437 438, 439, 448, 451, 452, 456, 457, 458, 459, 461, 462, 463, 464, 467, 468, 473 477, 478, 482, 483, 484, 498, 499, 502, 503, 505, 506, 507 *Elset, elset=_innerairabsorb_S2 407, 428, 436, 443, 471, 476, 504 *Elset, elset=_innerairabsorb_S1 402, 410, 414, 416, 422, 426, 434, 435, 440, 441, 444, 450, 453, 455, 460, 466 472, 475, 479, 481, 485, 486, 487, 488, 490, 491, 492, 495, 496, 497, 500 *Elset, elset=_innerairabsorb_S4 427, 432, 433, 442, 445, 446, 447, 449, 454, 465, 469, 470, 474, 480, 489, 493 494, 501 *Surface, name=innerairabsorb _innerairabsorb_S3, S3 _innerairabsorb_S2, S2 _innerairabsorb_S4, S4 _innerairabsorb_S1, S1 ** ---------------------------------------------------------------- ** ** MATERIALS ** *Material, name=air *Acousticmedium,bulkmodulus 1.42e5, *Density 1.2, *Material, name=airabsorb *Acousticmedium,bulkmodulus 1.42e5, *Acousticmedium,volumetricdrag 1.2, *Density 1.2, *Material, name=steel *Density 7920., *Elastic 1.9e+11, 0.3 ** ---------------------------------------------------------------- *Tie,name=acost1 innerair2shell, shell2innerair ** ** BOUNDARY CONDITIONS AND CONSTRAINTS ** *Boundary shellsym,zsymm *Equation 2 shellconstraint,1,0.176326981, shellconstraint,3,-1. 2 shellconstraint,2,1., shellsym,2,-1. ** ---------------------------------------------------------------- ** ** STEP: Step-1 ** *Step Step-1: Frequency Response *Steady State Dynamics, direct, frequency scale=linear 179.0,181.0,12 *Boundary inletpressure,8,8,1.0 *Simpedance,non=plan innerairoutlet, *Output,field,op=new,frequency=6 *Node output U,POR *Output,history,op=new,frequency=1 *Node output,nset=centerline POR, *Node output,nset=shelldisp U, *Node file,nset=centerline,frequency=1 COORD,POR,PPOR *Node file,nset=shell,frequency=1 U,PU *End step